remove build matrix and create release in the end of build to avoid downtime in binary availability (#196)

.github/workflows/build.yml

@@ -9,47 +9,8 @@ on:
   pull_request:
 
 jobs:
-  prepare-release:
-    if: startsWith(github.ref, 'refs/tags/v')
-    runs-on: ubuntu-latest
-    steps:
-      - name: Clone project
-        uses: actions/checkout@v2
-
-      - name: Build changelog
-        id: build_changelog
-        uses: mikepenz/release-changelog-builder-action@v1
-        with:
-          configuration: .github/changelog_conf.json
-          failOnError: true
-          ignorePreReleases: true
-          commitMode: true
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Create release
-        uses: softprops/action-gh-release@v1
-        with:
-          body: ${{ steps.build_changelog.outputs.changelog }}
-          files: |
-            LICENSE
-          fail_on_unmatched_files: true
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-
   build:
-    name: build-${{ matrix.os }}
-    if: always()
-    needs: prepare-release
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - os: ubuntu-20.04
-            asset_name: smp-server-ubuntu-20_04-x86-64
-          - os: ubuntu-18.04
-            asset_name: smp-server-ubuntu-18_04-x86-64
+    runs-on: ubuntu-20.04
     steps:
       - name: Clone project
         uses: actions/checkout@v2
@@ -65,19 +26,38 @@ jobs:
         uses: actions/cache@v2
         with:
           path: ~/.stack
-          key: ${{ matrix.os }}-${{ hashFiles('stack.yaml') }}
+          key: ${{ hashFiles('stack.yaml') }}
 
       - name: Build & test
         id: build_test
         run: |
           stack build --test --force-dirty
-          echo "::set-output name=LOCAL_INSTALL_ROOT::$(stack path --local-install-root)"
-
-      - name: Upload binaries to release
+          install_root=$(stack path --local-install-root)
+          mv ${install_root}/bin/smp-server smp-server-ubuntu-20_04-x86-64
+      
+      - name: Build changelog
         if: startsWith(github.ref, 'refs/tags/v')
-        uses: svenstaro/upload-release-action@v2
+        id: build_changelog
+        uses: mikepenz/release-changelog-builder-action@v1
         with:
-          repo_token: ${{ secrets.GITHUB_TOKEN }}
-          file: ${{ steps.build_test.outputs.LOCAL_INSTALL_ROOT }}/bin/smp-server
-          asset_name: ${{ matrix.asset_name }}
-          tag: ${{ github.ref }}
+          configuration: .github/changelog_conf.json
+          failOnError: true
+          ignorePreReleases: true
+          commitMode: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      
+      - name: Create release
+        if: startsWith(github.ref, 'refs/tags/v')
+        uses: softprops/action-gh-release@v1
+        with:
+          body: |
+            See full changelog [here](https://github.com/simplex-chat/simplexmq/blob/master/CHANGELOG.md).
+            Commits, chronological:
+            ${{ steps.build_changelog.outputs.changelog }}
+          files: |
+            LICENSE
+            smp-server-ubuntu-20_04-x86-64
+          fail_on_unmatched_files: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}